New Optical Head for Magneto-optic Library Units

M. Moritsugu; S. Arai; A. Futamata; F. Abe; K. Ogawa

doi:10.1117/12.952753

19 May 1989 New Optical Head for Magneto-optic Library Units

M. Moritsugu, S. Arai, A. Futamata, F. Abe, K. Ogawa

Proceedings Volume 1078, Optical Data Storage Topical Meeting; (1989) https://doi.org/10.1117/12.952753
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

We have developed a magneto-optical head to provide both fast access and large memory capacities for optical library systems. It features a pair of optical heads which face each other on opposite sides of the disk, and a new tracking method which enables a wide tracking range. The bias coil to generate the magnetic field is mounted around the objective lens of each optical head. The two opposing bias coils can generate an interlocking magnetic field of more than 250 Oe. We call this bias-coil driving method the push-pull driving. The power consumption needed for a 250 Oe field is only 2 W. A new tracking method makes it possible to use a stepping motor for coarse access. Two stepping motors are used not only for on-media access but also for media-to-media access, which help to miniaturize the drive. A good magneto-optical readout signal was obtained. Its carrier-to-noise ratio is more than 50 dB for a mark length of I gm. We confirmed that this signal level is sufficient for recording on magneto-optical disks.

Citation Download Citation

M. Moritsugu, S. Arai, A. Futamata, F. Abe, and K. Ogawa "New Optical Head for Magneto-optic Library Units", Proc. SPIE 1078, Optical Data Storage Topical Meeting, (19 May 1989); https://doi.org/10.1117/12.952753

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KEYWORDS

Head

Magnetism

Objectives

Data storage

Reflectivity

Beam splitters

Optical tracking

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